MELT CONDITIONED HIGH PRESSURE DIE CASTING (MC-HPDC) OF Mg-ALLOYS
MELT CONDITIONED HIGH PRESSURE DIE CASTING (MC-HPDC) OF Mg-ALLOYS
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镁合金熔融状态高压压铸 (MC-HPDC)
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Z. Fan
中科院分区：
文献类型：
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作者：
S. Tzamtzis;Huawei Zhang;G. Liu;Y. Wang;N. Babu;Z. Fan
高压压铸工艺具有成本低、效率高的特点。然而，HPDC镁合金铸件存在组织不均匀、化学偏析以及大量的铸造缺陷，如气孔、热裂等。最近，我们开发了一种新的成形铸造工艺，即熔体条件高压压铸(MC-HPDC)，该工艺将液态金属在MCAST(熔体高级剪切调节技术)提供的强强制对流和强烈剪切作用下进行调节，然后转移到传统的HPDC机器上进行成形铸造。熔体调质可在合金液相线以上和以下温度下进行。与传统的HPDC工艺相比，MC-HPDC工艺提供了组织细小均匀的铸件，大大减少了铸造缺陷，并显著提高了力学性能。本文介绍了MC-HPDC镁合金在不同条件下的组织和力学性能，并讨论了条件熔体的凝固行为。
The high pressure die casting (HPDC) process is characterized by low cost and high efficiency. However, HPDC Mg-alloy components have non-uniform microstructure, chemical segregation, and substantial amount of casting defects, such as porosity and hot tearing. Recently, we have developed a new shape casting process named as melt conditioned high pressure die casting (MC-HPDC) where liquid metal is conditioned under intensive forced convection and intensive shearing provided by the MCAST (melt conditioning by advanced shear technology) unit, and then transferred to a conventional HPDC machine for shape casting. Melt conditioning can be done at temperatures both above and bellow the liquidus of the alloy. Compared to conventional HPDC, the MC-HPDC process offers cast components with fine and uniform microstructure, much reduced cast defects and substantially improved mechanical properties. In this paper we present the microstructures and mechanical properties of Mg-alloys processed by MC-HPDC under different conditions and discuss the solidification behavior of conditioned melt.